[MacPorts] #57726: pgplot demo 'cpgdemo' segfaults with variant gcc8, ok with gcc7

[MacPorts]

#57726: pgplot demo 'cpgdemo' segfaults with variant gcc8, ok with gcc7
--------------------+--------------------
 Reporter:  d-lamb  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  pgplot
--------------------+--------------------
 Just like the title says.  I installed the default pgplot
 @5.2.2_11+gcc8+x11, and the demos /opt/local/share/pgplot/examples/pgdemo*
 work just fine, but cpgdemo (which shows the C-language bindings) in that
 same directory segfaults when drawing the second plot.

 I installed pgplot @5.2.2_11+gcc7+x11, and now cpgdemo works just fine.
 Is there something special about how the C interface libcpgplot.dylib gets
 made with gcc8?

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Ticket URL: <https://trac.macports.org/ticket/57726>
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